<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item of hotCities"
            :key="item.id"
            @click="clickToChangeCity(item.name)">
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area"
        v-for="(item, key) of cities"
        :key="key"
        :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div
            class="item border-bottom"
            v-for="innerItem of item"
            :key="innerItem.id"
            @click="clickToChangeCity(innerItem.name)">{{innerItem.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapState, mapMutations} from 'Vuex'
export default ({
  name: 'CityList',
  props: {
    city: String,
    cities: Object,
    hotCities: Array,
    letter: String
  },
  computed: {
    // 展开运算符
    ...mapState({
      currentCity: 'city'
    })
  },
  watch: {
    cities () {
      this.$nextTick(function () {
        this.scroll.refresh()
      })
    },
    // 点击字母进行对应area的跳转
    letter () {
      const element = this.$refs[this.letter][0]
      this.scroll.scrollToElement(element)
    }
  },
  methods: {
    clickToChangeCity (city) {
      // Vuex 如果组件要修改数据 必须通过dispatch 来触发actions
      // this.$store.dispatch('changeCity', city)
      // 已通过 mapMutation 注册事件
      this.changeCity(city)
      // 修改所在城市之后 进行路由跳转回到首页
      this.$router.push('/')
    },
    // Vuex 用法 将mutatons方法注册在组件methods中
    // 此时可以直接调用
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper, {
      // 加入属性 使better-scroll生成的可以点击
      click: true
    })
  }
})
</script>

<style lang="stylus" scoped>
  @import '~@/assets/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow: hidden
    position:absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        width: 33.3%
        float: left
        .button
          text-align: center
          padding: .1rem 0
          margin: .1rem
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>
